In Canto One of his poem John Shade (the poet in VN’s novel Pale Fire, 1962) mentions Sherlock Holmes:
Retake the falling snow: each drifting flake
Shapeless and slow, unsteady and opaque,
A dull dark white against the day's pale white
And abstract larches in the neutral light.
And then the gradual and dual blue
As night unites the viewer and the view,
And in the morning, diamonds of frost
Express amazement: Whose spurred feet have crossed